“DETERMINATION OF THE CRITICAL PERIOD OF COMPETITION OF WEEDS IN COWPEA BEAN Vigna unguiculata (Walp) IN ALANJE, PANAMA, 1989”. (1991) Ciencia Agropecuaria, (7), pp. 43–48. Available at: https://idiap.desarrollo-ojs1.metadatos.org/index.php/ciencia-agropecuaria/article/view/495 (Accessed: 9 October 2026).